Lead block



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D. LAWSON LEAD LOGK Filed Jan. 27 1921 INVENTOR Y 'vAvEnporzT-Lnwson V'JM ATPORIVEYS-l l l WITNESS 14,/

Patented dune 12, 1923..

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DAVENPORT LAWSON, OF ELK, CALIFORNLA, ASSEGNOR TO GOODYEAR REDWOOD CO.,

F ELK, CALIFORNIA, A CORPORATION 0F MAINE.

LEAD BLOCK.

Application filed January 27, 1921. Serial No. 440,295.

To all tlf/tom t may concern:

Be it known that l, DAVENPORT LAWSON,

a citizen of the United States, and a resident of Elk, county ofMendocino, and State of California, have invented a new and useful LeadBlock, of which the following is a specification.

My invention relates to sheave blocks and the broad purpose of myinvention is to provide an improved lead block for the lifting andcontrol lines of my logging apparatus which is the subject of mycopending application Serial Number 437,692, filed January 17, 1921 andpatented @ctober 25, 1921, No. 1,394,745. More particularly, an objectof my invention is the provision of a block in which both lifting andcontrol lines are handled without danger of tangling, and characterizedby simplicity and strength required in this service. Another object isthe provision of a block of large size and great weight which may beassembled from relatively small and easily provided parts.

The invention possesses other objects and features of advantage, some ofwhich, with the foregoing, will be set forth in the followingdescription of the preferred form of my invention which is illustratedin the drawings accompanying and forming part of the specification. Itis to be understood that I do not limit myself to the showing made bythe said drawings and description, as l may adopt variations of thepreferred form within the scope of my invention as set forth in theclaims.

Referring to the drawings: Fig. 1 is a front elevation of the block andF ig. 2 is a side elevation.

The block of my invention comprises twin inside frame plates 2, eachformed with a central boss 3, and laterally projecting arms 4. Stifeningwebs 6 extending from the boss 3 are disposed on the frame and arms. Thetwin plates are connected by a stiffening bar 7, preferably a section ofpipe socketed in the bosses, and at their lower ends by a foot yoke 8pinned to each frame plate between the lugs 9 formed thereon by thebolts 1l.

Arranged adjacent each frame plate 2 is an outside frame plate 12similar to the inside plate and connected to it by the bolt 18 at thefoot end which passes thru a spacing shell 14. At the head end, theframe plates are connected by the Ueform bar 16 pinned to each the bolts17.

The bosses of each pair of inside and outside frame plates are formedwith alined bearings in which a shaft 1S is journaled in bushing 19.Fixed on the shaft to turn between the frame plates is a sheave orpulley 21 grooved about its periphery to carry one of the lifting lines.A grease cup 22 fixed in each boss provides means for feeding lubricantte the shaft bea-ring.v The outer bearing is closed by a cover plate 28,the stiffening bar 7 acting as a closure for the inside bearings. Inorder to direct the lines into the bl'ock, an arcuate guide 24 is boltedto each inside and outside frame, and extends around the upper half ofthe sheave. A head yoke 26 provided with apertures 27 for the attachmentof the anchor lines, connects the U-bars of the twin frames, beingpinned thereto by bolts 2S. llhe head yoke is also provided withapertures 29 for the convenient attachment of other lines.

Swung from the center of the foot yoke by a clevis 31 and U-bar 32 is asingle frame, mounting the sheave 33 over which runs the control linefor the traveller carried by the lifting lines. The frame plates 84 ofthe single frame. are duplicates and the same as the outside frameplates 12 of the twin frames. The structures of shea-ve shaft, bearingsand guides are also the same as those already described.

The block illustrated herein contains sheaves 16 in diameter mounted onhardened steel shafts 232; in diameter. The service in which it is usedinvolves supporting a double lifting line extending over a space asgreat as 5000 feet, together with a heavy carrier and thecarrier'control lines and the 2. A block comprising twin frames, a l010g swung from the carrier. sheave in each of said frames,` aJ head andI claim: a, foot yoke connecting said frames, a single l. A blockcomprising twin frames, a frame suspended from sadfoot yoke, and sheavein each of said frames, means cona sheave n Said s'ngleframe. nectingsaid frames for holding them in In testimony whereof, I have hereunto-15xelv rel etionawsingle framev pvotally Susset my hand. pended fromsaidtwin frames, and asheave in said single frame. DAVENPORT LAWSON.

